blue (instead of green) navigation light

[steadyeddy]

Sorry chaps cannot help with this as i have colour blindness ,i could not get in Royal Navy got in the Merchant Navy as a Steward i had always wanted to be in the Royal Navy.

 

[LadyInBed]

look here
Aqua Signal TD40 - Ship Salvage Blue Red Signal Navigation Light - Bi-Colour | eBay

If the image is the correct way up, the red is on the Starboard side.
Is this correct, I don't know what lights are shown for night time salvage operations are!

 

[allanc]

The image is upside down. The wiring will, for the sake of water ingress prevention, enter at the bottom of the unit. And the red will correctly be to port.
It s probable that if you put a bulb behind the blue lens that the predominant colour will be green.

 

[ltcom]

As sarabande says.
It is important to be green.
The ebay seller is not experienced. The filter looks blue and they have called it blue. With an incandescent bulb, green will be seen. With a carefully selected LED as others have said, green will shine through probably.
Nothing wrong with housing or filter just a poor description and buyer must insert a bulb that lets green out.

 

[mikefleetwood]

It s probable that if you put a bulb behind the blue lens that the predominant colour will be green.

Going back to the days of mechanical signalling on the railways, the "green" glass of the signal was always blue. The reason being that the lamps were paraffin fuelled and burnt with a broad-spectrum yellow flame that would show as green through a blue glass. I imagine the same would apply to paraffin/candle navigation lamps.

 

[ltcom]

Going back to the days of mechanical signalling on the railways, the "green" glass of the signal was always blue. The reason being that the lamps were paraffin fuelled and burnt with a broad-spectrum yellow flame that would show as green through a blue glass. I imagine the same would apply to paraffin/candle navigation lamps.

Yes. as Mike says, incandescent bulbs are more yellow than white, just like a natural flame. You may have trouble finding a warm white led that is yellow enough to show green through the blue filter. Being aqua signal, an aqua signal incandescent bulb will show green I think for sure.

 

[LadyInBed]

Avatar

Ok, it's off topic but I would love to know, was it painful to have that tattoo engraved on your brest? ?

 

[lustyd]

If colour was important we'd have abandoned red and green years ago. Fit some lights and go sailing, it makes very little difference which lights.

 

[JumbleDuck]

Many languages use the same word for "blue" and "green" - there's even a wikipedia page about it. Maybe the seller's first language is one of these?

 

[sarabande]

When I did my Board of Trade Ocean exams >50 years ago, we were told that colour for lights was very carefully tested. Only the finest oil from sperm whales was used in the test lamps, as it had been found the wavelength of this light was consistent.

Certainly "Lamp Oil" for old fashioned oil nav lights was a lot more expensive than ordinary domestic lamp oil .

 

[Krzysztof89]

There are blue lamps in use on some areas where local regulations are in power.

Under the Polish law (on The Baltic Sea) blue lamps are use by The Police and The Polish Navy.